I would reccomend looking for a Japanese company that makes an overlay because all the cars in Japan are going to be in kph. I mean, the car is Japanese so you would think that some Japanese company would make something, right? If that doesn't work, try to find a European company that makes overlays for European Celicas. Get my stratagy?
And if all that fails you, you could always have them custom made from speed hut
, they will make 100% custom overlays for you.